It might be all new to you, but Content Analysis is perfectly respectable. Re Sapir finding the word 'certain' dodgy, many judges immediately start sniffing a lie when people in the witness box use words like, 'Obviously'. It's often a flag they are trying to persuade the court a thing is obvious when it is anything but.
It's an interesting art. When I spent a couple weeks one summer selling encyclopaedias we were told to emphasis the word 'just' in front of the price (which was far from cheap!). Whilst few reputable sales men believe they tell outright lies, none the less their sales patter includes, 'overcoming the customer's resistance', pointing out the neighbours have bought one, claiming a major discount is available only for an extremely short time (i.e., now), offering easy payment terms, it is all the same technique that innocence fraudsters use, 'It was only a murder, what's the big deal', 'does he look like a murderer?' 'we can offer you alternative explanations', 'the client had their human rights breached' and the usual sympathy card stuff.
But you knew that already. You know perfectly well Knox and Raff's 'innocence projects' are sham.
You are a salesperson pushing your wares.
We can do a statement analysis and see that this is so.